Your friend Mr. Han could not use his dictionary because of your fault, and write a letter in about 100 words to express your apology.
Do not sign your own name, using "Li Ming" instead.
Do not write the address.
参考答案：
Dear Mr. Han,
I’m writing this letter to apologize to you for the mistake that I have done yesterday.
Because of my carelessness, I got your dictionary mistakenly with mine, and lent it to Tom. I have acknowledged that my fault has brought you great trouble and inconveniences because you had to use the dictionary that day. I will bring you the dictionary as soon as possible.
Hope you can accept my apology and understand my situation.
Yours sincerely,
Li Ming